Add LOG.isDebugEnabled() guard for each LOG.debug("...")
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Key: HDFS-1320
URL: https://issues.apache.org/jira/browse/HDFS-1320
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 0.22.0
Reporter: Erik Steffl
Fix For: 0.22.0
Each LOG.debug("...") should be executed only if LOG.isDebugEnabled() is true,
in some cases it's expensive to construct the string that is being printed to
log. It's much easier to always use LOG.isDebugEnabled() because it's easier to
check (rather than in each case reason wheather it's neccessary or not).
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